Bulk blends are mixed fertilizers, prepared without chemical reactions by mixing dry granular fertilizers, in order to obtain a multi-nutrient formulation.

Bulk blending is popular because the production method allows a flexible combination of nutrients at chosen ratios, and the use of different types of fertilizers. Bulk blending provides the opportunity to prepare special blends with nutrient ratios to suit the particular farmer's needs, appropriate to the status of his soils and crops. Matching bulk blends to the specific nutrient requirements of the crop helps to optimize the use of the applied nutrients and protects the environment through balanced nutrition.

Farmers can mix the various component fertilizers themselves, or purchase blends appropriate to their needs from dealers who operate bulk-blending equipment.

The fertilizers in the mixture must have compatible chemical and physical properties to enable chemically stable, non-segregating blends.